Bean property 'RegDao' is not writable or has an invalid setter method. Does the parameter type of t

Bean property 'RegDao' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter? 的解决方案  

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'RegService' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'RegDao' of bean class [com.starheld.serviceimp.RegServiceImp]: Bean property 'RegDao' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
    Caused by:
    org.springframework.beans.NotWritablePropertyException: Invalid property 'RegDao' of bean class [com.starheld.serviceimp.RegServiceImp]: Bean property 'RegDao' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
     at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:751)
     at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:608)
     at org.springframework.beans.AbstractPropertyAccessor.setPropertyValue(AbstractPropertyAccessor.java:49)
     at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:74)
     at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:57)
     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:970)
     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:729)
     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:416)
     at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:245)
     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:141)
     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:242)
     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:156)
     at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:290)
     at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:348)
     at org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.refresh(AbstractRefreshableWebApplicationContext.java:156)
     at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:246)
     at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:184)
     at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:49)
     at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3764)
     at org.apache.catalina.core.StandardContext.start(StandardContext.java:4216)
     at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)
     at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)
     at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)
     at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:920)
     at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:883)
     at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
     at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)
     at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
     at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)
     at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
     at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
     at org.apache.catalina.core.StandardService.start(StandardService.java:448)
     at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
     at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
     at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)

 

如上报错是由于 注入dao名和注入service名写错了，必须要保证程序中的getter setter方法中的命名和注入名一致。

applicationContext.xml中的配置如下：

                     <bean id="RegDao" class="com.starheld.daoimp.RegDaoImp" scope="singleton">
  <property name="sessionFactory" ref="sessionFactory"></property>
 </bean>
 <!--  把service交给Dao -->
 
  <bean id="RegService" class="com.starheld.serviceimp.RegServiceImp">
  <property name="reg" ref="RegDao"></property>
 </bean>

 <bean id="reg" class="com.starheld.action.RegAction">
  <property name="regservice" ref="RegService"></property>
 </bean>

程序中的配置如下：

action的部分代码：

public class RegAction extends ActionSupport {

 private User user;
 private RegService regservice;

 public RegService getRegservice() {
  return regservice;
 }

 public void setRegservice(RegService regservice) {
  this.regservice = regservice;
 }

 public User getUser() {
  return user;
 }

 public void setUser(User user) {
  this.user = user;
 }

serviceImp.java代码：

public class RegServiceImp implements RegService {
 
 public RegDao reg;

 
 public boolean find(String username) {
  // 查找用户名是否存在
  
  return reg.find(username);
 }

 public void saveReg(User user) {
  // 保存注册信息
  this.reg.SaveUser(user);
 }

 public RegDao getReg() {
  return reg;
 }

 public void setReg(RegDao reg) {
  this.reg = reg;
 }

}

如上标红的就是要对应一致的。如果命名大小写不一致就会出现上面的异常。